Comment 2 for bug 129966

I have a similar problem too. In my Ubuntu Feisty with latest bzr version of AWN, the bubbles appears and then some times just doesn't disappear anymore, even if moving on another app's icon will remove the previous bubble and make another one appear.
The bubbles almost every time just appears and keeps staying still on the desktop,, even if the mouse is away, even if the Bar hides itself. Here's a complete video of how the bug works, sistematically and not occasionally (Easy to reproduce, as in the video).